The button for Redirect on PIR approvals, is a part of the Approval Process and not tied to a security profile permission.
Whether you are able to see the Redirect button is dependant on your Approval Process setup. (For more information on checking your Approval Process; Please search for an article called 'Check approval routing for purchase invoice (PIR) entries'
You can only use Redirect in PIR approval on those Approval Stages when both:
the Approver Type (on the approval stage) is set to a type which begins with Selected
Selected By Value
Selected from View
Selected from User List
AND the Approval Stage has been enabled to Allow Redirect To Any User
With the above set; it will allow users to transfer the approval to another Approve.
Note: They must both be a part of the same Approval Stage.
For example: If the approval is at Stage One, you will only be able to Redirect to other Stage One Approvers. If you do not have the redirect function available, your alternative options are:
Using the Out of Office function. Please search for our article on how to 'Set the Out of Office and delegate approvals'
Setting the relevant Security Profiles with Third Party Approval rights. Note: For FocalPoint version 5.2 and above.
Rejecting the PIR entry to initiator and re-submitting to a different approver. This will be dependant on your Approval Flow as to whether this is possible.